/* ================================ */
/* Sabi · 侘寂美学AI */
/* ================================ */

:root {
  /* 墨色系统 */
  --ink-black: #0D0906;
  --paper-white: #F5F2EB;
  --accent-red: #C8553D;
  --ink-fade: #2D2620;

  /* 排版 */
  --font-display: 'Playfair Display', serif;
  --font-body: 'Crimson Pro', 'Noto Serif SC', serif;

  /* 尺寸戏剧性对比 */
  --size-hero: clamp(80px, 15vw, 180px);
  --size-title: clamp(32px, 6vw, 72px);
  --size-text: clamp(15px, 2vw, 18px);

  /* 节奏 */
  --spacing-xs: 8px;
  --spacing-sm: 16px;
  --spacing-md: 32px;
  --spacing-lg: 64px;
  --spacing-xl: 128px;

  /* 动画 */
  --transition-slow: 1.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-medium: 0.6s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-fast: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --spring-bounce: cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* ===== 基础重置 ===== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: var(--font-body);
  background: var(--paper-white);
  color: var(--ink-black);
  line-height: 1.8;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  overscroll-behavior: none; /* 禁用过度滚动 */
}

/* ===== 墨水染渍背景 ===== */
.sabi-container {
  min-height: 100vh;
  position: relative;
  display: grid;
  grid-template-rows: auto auto 1fr auto;
  gap: var(--spacing-md);
  padding: var(--spacing-lg) var(--spacing-md);
  padding-bottom: 240px; /* 为浮动输入框留出更多空间 */
  background:
    repeating-linear-gradient(
      90deg,
      transparent 0,
      transparent 2px,
      rgba(200, 200, 190, 0.1) 2px,
      rgba(200, 200, 190, 0.1) 4px
    ),
    linear-gradient(180deg, var(--paper-white) 0%, #EDE8E0 100%);
}

.ink-stains {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 0;
  opacity: 0.6;
}

.stain {
  position: absolute;
  opacity: 0.4;
  animation: float 20s ease-in-out infinite;
}

.stain-1 {
  top: 10%;
  right: 5%;
  width: 40vw;
  height: 40vw;
  animation-delay: 0s;
}

.stain-2 {
  top: 50%;
  left: 10%;
  width: 30vw;
  height: 30vw;
  animation-delay: -7s;
}

.stain-3 {
  bottom: 15%;
  right: 15%;
  width: 20vw;
  height: 20vw;
  animation-delay: -14s;
}

@keyframes float {
  0%, 100% {
    transform: translate(0, 0) scale(1);
  }
  33% {
    transform: translate(20px, -30px) scale(1.05);
  }
  66% {
    transform: translate(-15px, 20px) scale(0.95);
  }
}

/* ===== 标题区域：超大排版 ===== */
.sabi-header {
  text-align: center;
  margin-bottom: var(--spacing-xl);
  animation: fadeSlideDown 1.2s ease-out;
}

@keyframes fadeSlideDown {
  from {
    opacity: 0;
    transform: translateY(-40px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.title-main {
  font-family: var(--font-display);
  font-size: var(--size-hero);
  font-weight: 900;
  letter-spacing: 0.2em;
  margin-bottom: var(--spacing-xs);
  color: var(--ink-black);
  line-height: 1;
  text-shadow:
    0 4px 12px rgba(13, 9, 6, 0.08),
    0 2px 4px rgba(13, 9, 6, 0.04);
}

.title-sub {
  font-family: var(--font-body);
  font-size: var(--size-title);
  font-weight: 300;
  letter-spacing: 0.4em;
  margin-bottom: var(--spacing-sm);
  color: var(--ink-fade);
  animation: fadeIn 1.6s ease-out;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.title-desc {
  font-size: calc(var(--size-text) * 0.9);
  font-weight: 300;
  color: var(--ink-fade);
  letter-spacing: 0.8em;
  opacity: 0.6;
  animation: fadeIn 2s ease-out;
}

/* ===== 控制区域：不对称布局 ===== */
.sabi-controls {
  display: flex;
  gap: var(--spacing-sm);
  justify-content: flex-start;
  margin-left: 15%;
  flex-wrap: wrap;
  animation: slideInLeft 0.8s ease-out 0.3s both;
}

@keyframes slideInLeft {
  from {
    opacity: 0;
    transform: translateX(-60px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.control-btn {
  padding: var(--spacing-sm) var(--spacing-md);
  background: transparent;
  border: 1px solid rgba(13, 9, 6, 0.2);
  font-family: var(--font-body);
  cursor: pointer;
  transition: var(--transition-medium);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-xs);
  position: relative;
}

.control-btn:hover {
  background: rgba(13, 9, 6, 0.03);
  border-color: var(--ink-black);
}

.control-btn.active {
  background: var(--ink-black);
  color: var(--paper-white);
  border-color: var(--ink-black);
}

.btn-char {
  font-family: var(--font-display);
  font-size: 28px;
  font-weight: 600;
  line-height: 1;
}

.btn-text {
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  opacity: 0.7;
}

/* ===== 对话区域：竖排文字支持 ===== */
.sabi-chat {
  max-width: 800px;
  margin: 0 auto;
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
  padding: var(--spacing-md) var(--spacing-lg);
  overflow-y: auto;
  scroll-behavior: smooth;
  position: relative;
  z-index: 1;
}

/* 侘寂风格滚动条 - 横向模式 */
.sabi-chat::-webkit-scrollbar {
  width: 10px;
}

.sabi-chat::-webkit-scrollbar-track {
  background: rgba(30, 20, 10, 0.03);
  border-radius: 5px;
}

.sabi-chat::-webkit-scrollbar-thumb {
  background: rgba(200, 85, 61, 0.2);  /* 朱红色，淡雅 */
  border-radius: 5px;
  border: 2px solid transparent;
  transition: background 0.3s ease;
}

.sabi-chat::-webkit-scrollbar-thumb:hover {
  background: rgba(200, 85, 61, 0.4);  /* 悬停时加深 */
}

.sabi-chat::-webkit-scrollbar-thumb:active {
  background: var(--accent-red);  /* 滚动时完全显色 */
  border: none;
}

/* Firefox 滚动条样式 */
.sabi-chat {
  scrollbar-width: thin;  /* 细滚动条 */
  scrollbar-color: rgba(200, 85, 61, 0.2) transparent;  /* 朱红色滚动条 */
}

.sabi-chat:hover {
  scrollbar-color: rgba(200, 85, 61, 0.4) transparent;  /* 悬停时加深 */
}

/* 竖排文字 */
.sabi-chat.vertical-mode {
  writing-mode: vertical-rl;
  text-orientation: mixed;
  max-width: none;
  max-height: 70vh;
  overflow-x: auto;
  overflow-y: hidden;
  padding: var(--spacing-lg);
  white-space: nowrap;
  -webkit-overflow-scrolling: touch;
}

/* 侘寂风格滚动条 - 竖排模式 */
.sabi-chat.vertical-mode::-webkit-scrollbar {
  width: 10px;
  height: 16px;
}

.sabi-chat.vertical-mode::-webkit-scrollbar-track {
  background: rgba(30, 20, 10, 0.08);
  border-radius: 8px;
  margin: 4px;
}

.sabi-chat.vertical-mode::-webkit-scrollbar-thumb {
  background: rgba(200, 85, 61, 0.4);
  border-radius: 8px;
  border: 2px solid rgba(245, 242, 235, 0.3);
  min-width: 30px;
  transition: background 0.3s ease;
}

.sabi-chat.vertical-mode::-webkit-scrollbar-thumb:hover {
  background: rgba(200, 85, 61, 0.7);
}

.sabi-chat.vertical-mode::-webkit-scrollbar-thumb:active {
  background: var(--accent-red);
  border-color: transparent;
}

/* Firefox 竖排模式滚动条 */
.sabi-chat.vertical-mode {
  scrollbar-width: thin;
  scrollbar-color: rgba(200, 85, 61, 0.4) rgba(30, 20, 10, 0.08);
}

.sabi-chat.vertical-mode:hover {
  scrollbar-color: rgba(200, 85, 61, 0.7) rgba(30, 20, 10, 0.08);
}

.sabi-chat.vertical-mode .message-item {
  writing-mode: vertical-rl;
  text-orientation: mixed;
  margin: 0 var(--spacing-sm);
  padding: var(--spacing-sm);
  display: inline-block;
  vertical-align: top;
  white-space: normal;
  height: auto;
  min-height: min-content;
  max-height: none;
}

.sabi-chat.vertical-mode .message-item.user {
  margin-left: 0;
  margin-right: var(--spacing-sm);
}

.sabi-chat.vertical-mode .message-item.assistant {
  margin-right: 0;
  margin-left: var(--spacing-sm);
}

.sabi-chat.vertical-mode .message-bubble {
  min-height: 250px;
  max-height: 80vh;  /* 限制最大高度，防止溢出背景 */
  display: inline-flex;  /* 使用flex布局，让内容和时间自然排列 */
  flex-direction: column;  /* 垂直方向排列 */
  overflow-wrap: break-word;
  word-wrap: break-word;
  word-break: break-word;
  hyphens: auto;
  height: max-content;
  width: auto;
  position: relative;
  padding: 30px 25px 20px 25px;  /* 减少底部padding，时间在内容后 */
  overflow: visible;
}

.sabi-chat.vertical-mode .message-content {
  writing-mode: vertical-rl;
  text-orientation: sideways-right;  /* 英文数字顺时针旋转90度，正面朝向读者 */
  display: block;
  white-space: pre-wrap;
  word-wrap: break-word;
  overflow-wrap: break-word;
  word-break: break-word;
  line-height: 2.2;
  max-height: 80vh;  /* 限制最大高度，防止溢出 */
  height: auto;
}

/* 纵向模式下时间横向显示 */
.sabi-chat.vertical-mode .message-time {
  writing-mode: horizontal-tb;
  text-orientation: mixed;
  position: relative;
  margin-top: 15px;
  padding: 3px 6px;
  border-radius: 3px;
  font-size: 11px;
  font-family: 'Courier New', monospace;
  letter-spacing: 1px;
  white-space: nowrap;
  display: inline-block;
  color: rgba(13, 9, 6, 0.6);
}

/* 用户消息时间样式 */
.sabi-chat.vertical-mode .message-item.user .message-time {
  background: rgba(232, 244, 248, 0.5);
}

/* AI消息时间样式 */
.sabi-chat.vertical-mode .message-item.assistant .message-time {
  background: rgba(240, 232, 224, 0.5);
}

/* 竖排模式Markdown调整 */
.sabi-chat.vertical-mode .message-content.markdown-body {
  writing-mode: vertical-rl;
  text-orientation: sideways-right;  /* 英文数字顺时针旋转90度，正面朝向读者 */
}

.sabi-chat.vertical-mode .message-content.markdown-body h1,
.sabi-chat.vertical-mode .message-content.markdown-body h2,
.sabi-chat.vertical-mode .message-content.markdown-body h3,
.sabi-chat.vertical-mode .message-content.markdown-body h4 {
  margin-top: 0.5em;
  margin-bottom: 0.3em;
}

.sabi-chat.vertical-mode .message-content.markdown-body p {
  margin: 0.3em 0;
}

.sabi-chat.vertical-mode .message-content.markdown-body ul,
.sabi-chat.vertical-mode .message-content.markdown-body ol {
  padding-left: 0;
  padding-top: 1em;
}

.sabi-chat.vertical-mode .message-content.markdown-body pre {
  max-width: none;
  width: auto;
  overflow-x: auto;
  white-space: pre-wrap;
  word-wrap: break-word;
}

.message-item {
  animation: messageReveal 0.8s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
}

.message-item.new-message {
  animation: newMessageHighlight 2s ease-out;
}

@keyframes newMessageHighlight {
  0%, 10% {
    background: rgba(200, 85, 61, 0.15);
    transform: scale(1.02);
  }
  100% {
    background: transparent;
    transform: scale(1);
  }
}

/* 用户消息聚焦效果 */
.message-item.user-message-focus {
  animation: userMessageFocus 1.5s ease-out;
}

@keyframes userMessageFocus {
  0%, 15% {
    transform: translateX(8px);
    box-shadow: 0 0 20px rgba(13, 9, 6, 0.1);
  }
  100% {
    transform: translateX(0);
    box-shadow: none;
  }
}

@keyframes messageReveal {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.message-item.user {
  margin-left: 15%;
}

.message-item.assistant {
  margin-right: 15%;
}

.message-bubble {
  padding: var(--spacing-md) var(--spacing-lg);
  background: rgba(255, 255, 255, 0.6);
  border: 1px solid rgba(13, 9, 6, 0.15);
  backdrop-filter: blur(8px);
  position: relative;
  transition: var(--transition-fast);
}

.message-bubble:hover {
  background: rgba(255, 255, 255, 0.8);
  border-color: rgba(13, 9, 6, 0.3);
}

.message-item.user .message-bubble {
  background: var(--ink-black);
  color: var(--paper-white);
  border: none;
  position: relative;
}

.message-item.user .message-bubble::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background:
    linear-gradient(45deg, transparent 45%, rgba(255, 255, 255, 0.03) 50%, transparent 55%);
  pointer-events: none;
}

.message-content {
  font-size: var(--size-text);
  line-height: 2;
  font-weight: 300;
  white-space: pre-wrap;
  transition: all 0.2s ease;
}

/* Markdown内容样式 */
.message-content.markdown-body {
  white-space: normal;
}

.message-content.markdown-body h1,
.message-content.markdown-body h2,
.message-content.markdown-body h3,
.message-content.markdown-body h4 {
  font-family: var(--font-display);
  color: var(--ink-black);
  margin-top: 1.5em;
  margin-bottom: 0.8em;
  font-weight: 600;
}

.message-content.markdown-body h1 { font-size: 1.8em; }
.message-content.markdown-body h2 { font-size: 1.5em; }
.message-content.markdown-body h3 { font-size: 1.3em; }
.message-content.markdown-body h4 { font-size: 1.1em; }

.message-content.markdown-body p {
  margin: 1em 0;
  line-height: 2;
}

.message-content.markdown-body ul,
.message-content.markdown-body ol {
  margin: 1em 0;
  padding-left: 2em;
  line-height: 2;
}

.message-content.markdown-body li {
  margin: 0.5em 0;
}

.message-content.markdown-body code {
  background: rgba(13, 9, 6, 0.05);
  padding: 0.2em 0.4em;
  border-radius: 3px;
  font-family: 'Courier New', monospace;
  font-size: 0.9em;
  color: var(--accent-red);
}

.message-content.markdown-body pre {
  background: rgba(13, 9, 6, 0.03);
  border: 1px solid rgba(13, 9, 6, 0.1);
  border-radius: 4px;
  padding: 1em;
  overflow-x: auto;
  margin: 1em 0;
  font-size: 0.9em;
  line-height: 1.6;
}

.message-content.markdown-body pre code {
  background: none;
  padding: 0;
  color: var(--ink-black);
}

.message-content.markdown-body blockquote {
  border-left: 3px solid var(--accent-red);
  padding-left: 1em;
  margin: 1em 0;
  color: var(--ink-fade);
  font-style: italic;
}

.message-content.markdown-body a {
  color: var(--accent-red);
  text-decoration: none;
  border-bottom: 1px solid var(--accent-red);
  transition: opacity 0.2s ease;
}

.message-content.markdown-body a:hover {
  opacity: 0.7;
}

.message-content.markdown-body table {
  border-collapse: collapse;
  margin: 1em 0;
  width: 100%;
}

.message-content.markdown-body th,
.message-content.markdown-body td {
  border: 1px solid rgba(13, 9, 6, 0.1);
  padding: 0.5em 1em;
  text-align: left;
}

.message-content.markdown-body th {
  background: rgba(13, 9, 6, 0.05);
  font-weight: 600;
}

.message-content.markdown-body hr {
  border: none;
  border-top: 1px solid rgba(13, 9, 6, 0.1);
  margin: 2em 0;
}

.message-content.markdown-body img {
  max-width: 100%;
  height: auto;
  margin: 1em 0;
}

.message-content.markdown-body strong {
  font-weight: 600;
  color: var(--ink-black);
}

.message-content.markdown-body em {
  font-style: italic;
}

/* 深色主题Markdown样式 */
.sabi-container.dark-theme .message-content.markdown-body h1,
.sabi-container.dark-theme .message-content.markdown-body h2,
.sabi-container.dark-theme .message-content.markdown-body h3,
.sabi-container.dark-theme .message-content.markdown-body h4 {
  color: var(--paper-white);
}

.sabi-container.dark-theme .message-content.markdown-body code {
  background: rgba(245, 242, 235, 0.1);
  color: var(--accent-red);
}

.sabi-container.dark-theme .message-content.markdown-body pre {
  background: rgba(245, 242, 235, 0.05);
  border-color: rgba(245, 242, 235, 0.1);
}

.sabi-container.dark-theme .message-content.markdown-body pre code {
  color: var(--paper-white);
}

.sabi-container.dark-theme .message-content.markdown-body blockquote {
  border-left-color: var(--accent-red);
  color: rgba(245, 242, 235, 0.7);
}

.sabi-container.dark-theme .message-content.markdown-body a {
  color: var(--accent-red);
  border-bottom-color: var(--accent-red);
}

.sabi-container.dark-theme .message-content.markdown-body th {
  background: rgba(245, 242, 235, 0.05);
  color: var(--paper-white);
}

.sabi-container.dark-theme .message-content.markdown-body td {
  border-color: rgba(245, 242, 235, 0.1);
}

.sabi-container.dark-theme .message-content.markdown-body hr {
  border-top-color: rgba(245, 242, 235, 0.1);
}

.sabi-container.dark-theme .message-content.markdown-body strong {
  color: var(--paper-white);
}

/* 暗黑主题下竖排模式的时间显示 */
.sabi-container.dark-theme .sabi-chat.vertical-mode .message-time {
  color: rgba(245, 242, 235, 0.7);  /* 浅色文字，清晰可见 */
}

.sabi-container.dark-theme .sabi-chat.vertical-mode .message-item.user .message-time {
  background: rgba(200, 85, 61, 0.15);  /* 暗黑主题用户消息背景色调 */
}

.sabi-container.dark-theme .sabi-chat.vertical-mode .message-item.assistant .message-time {
  background: rgba(245, 242, 235, 0.08);  /* 暗黑主题AI消息背景色调 */
}

/* 暗黑主题滚动条 */
.sabi-container.dark-theme .sabi-chat::-webkit-scrollbar-track {
  background: rgba(245, 242, 235, 0.03);
}

.sabi-container.dark-theme .sabi-chat::-webkit-scrollbar-thumb {
  background: rgba(245, 242, 235, 0.15);
}

.sabi-container.dark-theme .sabi-chat::-webkit-scrollbar-thumb:hover {
  background: rgba(245, 242, 235, 0.25);
}

.sabi-container.dark-theme .sabi-chat::-webkit-scrollbar-thumb:active {
  background: var(--accent-red);
}

/* Firefox 暗黑主题 */
.sabi-container.dark-theme .sabi-chat {
  scrollbar-color: rgba(245, 242, 235, 0.15) transparent;
}

.sabi-container.dark-theme .sabi-chat:hover {
  scrollbar-color: rgba(245, 242, 235, 0.25) transparent;
}

/* 深色主题用户消息聚焦 */
.sabi-container.dark-theme .message-item.user-message-focus {
  animation: userMessageFocusDark 1.5s ease-out;
}

@keyframes userMessageFocusDark {
  0%, 15% {
    transform: translateX(8px);
    box-shadow: 0 0 20px rgba(245, 242, 235, 0.1);
  }
  100% {
    transform: translateX(0);
    box-shadow: none;
  }
}

.message-time {
  font-size: 11px;
  opacity: 0.4;
  margin-top: var(--spacing-sm);
  display: block;
  font-family: 'Courier New', monospace;
  letter-spacing: 0.1em;
}

/* ===== 输入区域：物理浮动 ===== */
.sabi-input {
  position: fixed;
  bottom: 40px; /* 不贴底，有悬浮感 */
  left: 50%;
  transform: translateX(-50%);
  z-index: 100;
  width: calc(100% - var(--spacing-lg) * 2);
  max-width: 800px;
  background: rgba(245, 242, 235, 0.25);  /* 默认更透明，不遮挡 */
  backdrop-filter: blur(15px) saturate(1.2);
  -webkit-backdrop-filter: blur(15px) saturate(1.2);
  padding: var(--spacing-md);
  border-radius: 16px;
  box-shadow:
    0 4px 16px rgba(13, 9, 6, 0.04),
    0 1px 4px rgba(13, 9, 6, 0.02),
    inset 0 1px 0 rgba(255, 255, 255, 0.5);
  border: 1px solid rgba(13, 9, 6, 0.05);
  will-change: transform, bottom, background, box-shadow;
  transition:
    transform 0.4s var(--spring-bounce),
    bottom 0.4s var(--spring-bounce),
    background 0.4s ease,
    box-shadow 0.4s ease,
    border-color 0.4s ease,
    max-width 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

/* 输入框控制区域 */
.input-controls {
  display: flex;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-sm);
  padding: var(--spacing-sm);
  background: rgba(255, 255, 255, 0.3);
  border-radius: 8px;
}

.control-group {
  flex: 1;
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.control-label {
  font-size: 12px;
  color: var(--ink-fade);
  letter-spacing: 0.1em;
  min-width: 32px;
}

.range-slider {
  flex: 1;
  height: 4px;
  background: rgba(13, 9, 6, 0.1);
  border-radius: 2px;
  outline: none;
  cursor: pointer;
  -webkit-appearance: none;
}

.range-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 14px;
  height: 14px;
  background: var(--ink-black);
  border-radius: 50%;
  cursor: pointer;
  transition: all 0.2s ease;
}

.range-slider::-webkit-slider-thumb:hover {
  background: var(--accent-red);
  transform: scale(1.2);
}

.range-slider::-moz-range-thumb {
  width: 14px;
  height: 14px;
  background: var(--ink-black);
  border-radius: 50%;
  cursor: pointer;
  border: none;
  transition: all 0.2s ease;
}

.range-slider::-moz-range-thumb:hover {
  background: var(--accent-red);
  transform: scale(1.2);
}

.range-value {
  font-size: 11px;
  color: var(--ink-fade);
  font-family: 'Courier New', monospace;
  min-width: 36px;
  text-align: right;
}

/* 有内容时 - 接近不透明 */
.sabi-input.has-content {
  background: rgba(245, 242, 235, 0.88);
  box-shadow:
    0 8px 32px rgba(13, 9, 6, 0.08),
    0 2px 8px rgba(13, 9, 6, 0.04),
    inset 0 1px 0 rgba(255, 255, 255, 0.8);
  border-color: rgba(13, 9, 6, 0.08);
}

/* 浮动效果 */
.sabi-input::before {
  content: '';
  position: absolute;
  bottom: -16px;
  left: 50%;
  transform: translateX(-50%);
  width: 60%;
  height: 32px;
  background: radial-gradient(ellipse, rgba(13, 9, 6, 0.06) 0%, transparent 70%);
  filter: blur(8px);
  pointer-events: none;
}

/* 悬停提升 */
.sabi-input:hover {
  transform: translateX(-50%) translateY(-4px);
  background: rgba(245, 242, 235, 0.45);
  box-shadow:
    0 8px 24px rgba(13, 9, 6, 0.06),
    0 2px 8px rgba(13, 9, 6, 0.04);
}

/* 有内容时悬停 */
.sabi-input.has-content:hover {
  background: rgba(245, 242, 235, 0.92);
  box-shadow:
    0 16px 48px rgba(13, 9, 6, 0.12),
    0 4px 16px rgba(13, 9, 6, 0.08);
}

/* 聚焦提升 */
.sabi-input.focused {
  transform: translateX(-50%) translateY(-8px);
  background: rgba(245, 242, 235, 0.65);
  box-shadow:
    0 16px 48px rgba(13, 9, 6, 0.1),
    0 4px 16px rgba(13, 9, 6, 0.08);
}

/* 有内容时聚焦 */
.sabi-input.has-content.focused {
  background: rgba(245, 242, 235, 0.95);
  box-shadow:
    0 24px 64px rgba(13, 9, 6, 0.16),
    0 8px 24px rgba(13, 9, 6, 0.12);
}

/* 滚动时压缩 */
.sabi-input.scrolling {
  transform: translateX(-50%) scale(0.98);
  opacity: 0.9;
}

.input-frame {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm);
  background: rgba(255, 255, 255, 0.6);
  border: 2px solid var(--ink-black);
  border-radius: 12px;
  backdrop-filter: blur(10px);
}

.input-field {
  flex: 1;
  background: transparent;
  border: none;
  outline: none;
  font-family: var(--font-body);
  font-size: var(--size-text);
  color: var(--ink-black);
  resize: none;
  min-height: 60px;
  max-height: 180px;
  line-height: 2;
}

.input-field::placeholder {
  color: rgba(13, 9, 6, 0.3);
}

.send-button {
  width: 60px;
  height: 60px;
  background: var(--ink-black);
  color: var(--paper-white);
  border: none;
  cursor: pointer;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 600;
  border-radius: 10px;
  transition: all 0.3s var(--spring-bounce);
  box-shadow: 0 4px 12px rgba(13, 9, 6, 0.2);
}

.send-button:hover {
  background: var(--accent-red);
  transform: scale(1.05);
}

.send-button:active {
  transform: scale(0.95);
}

.send-button:disabled {
  opacity: 0.3;
  cursor: not-allowed;
  transform: scale(1);
}

.send-text {
  letter-spacing: 0.3em;
}

.input-meta {
  display: flex;
  justify-content: space-between;
  margin-top: var(--spacing-xs);
  font-size: 11px;
  color: var(--ink-fade);
  letter-spacing: 0.2em;
  font-family: 'Courier New', monospace;
  opacity: 0.7;
}

.message-item.assistant.streaming .message-content::after {
  content: '▌';
  animation: blink 1s infinite;
  margin-left: 2px;
}

@keyframes blink {
  0%, 50% { opacity: 1; }
  51%, 100% { opacity: 0; }
}

/* ===== 回到最新按钮 ===== */
.scroll-to-bottom {
  position: fixed;
  bottom: 140px;
  right: calc(50% - 400px);
  width: 48px;
  height: 48px;
  background: rgba(13, 9, 6, 0.9);
  color: var(--paper-white);
  border: none;
  border-radius: 50%;
  cursor: pointer;
  z-index: 90;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 16px rgba(13, 9, 6, 0.2);
  transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
  opacity: 0;
  transform: translateY(20px) scale(0.8);
  pointer-events: none;
}

.scroll-to-bottom.show {
  opacity: 1;
  transform: translateY(0) scale(1);
  pointer-events: auto;
}

.scroll-to-bottom:hover {
  background: var(--accent-red);
  transform: translateY(-4px) scale(1.1);
  box-shadow: 0 8px 24px rgba(200, 85, 61, 0.3);
}

.scroll-to-bottom:active {
  transform: scale(0.95);
}

.scroll-icon {
  font-size: 24px;
  font-weight: 600;
  animation: bounce 2s ease-in-out infinite;
}

@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(4px); }
}

/* ===== 深色主题 ===== */
.sabi-container.dark-theme {
  background:
    repeating-linear-gradient(
      90deg,
      transparent 0,
      transparent 2px,
      rgba(80, 80, 80, 0.05) 2px,
      rgba(80, 80, 80, 0.05) 4px
    ),
    linear-gradient(180deg, var(--ink-black) 0%, #1A1510 100%);
  color: var(--paper-white);
}

.sabi-container.dark-theme .title-main {
  text-shadow:
    0 4px 12px rgba(245, 242, 235, 0.1),
    0 2px 4px rgba(245, 242, 235, 0.05);
}

.sabi-container.dark-theme .control-btn {
  border-color: rgba(245, 242, 235, 0.2);
}

.sabi-container.dark-theme .control-btn:hover {
  background: rgba(245, 242, 235, 0.05);
  border-color: var(--paper-white);
}

.sabi-container.dark-theme .control-btn.active {
  background: var(--paper-white);
  color: var(--ink-black);
  border-color: var(--paper-white);
}

.sabi-container.dark-theme .message-bubble {
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(245, 242, 235, 0.25);
  color: var(--paper-white);
}

.sabi-container.dark-theme .message-bubble:hover {
  background: rgba(255, 255, 255, 0.18);
}

.sabi-container.dark-theme .scroll-to-bottom {
  background: rgba(245, 242, 235, 0.9);
  color: var(--ink-black);
}

.sabi-container.dark-theme .scroll-to-bottom:hover {
  background: var(--accent-red);
  color: var(--paper-white);
}

.sabi-container.dark-theme .sabi-input {
  background: rgba(13, 9, 6, 0.25);  /* 默认更透明 */
  border-color: rgba(245, 242, 235, 0.08);
  box-shadow:
    0 4px 16px rgba(0, 0, 0, 0.15),
    0 1px 4px rgba(0, 0, 0, 0.1),
    inset 0 1px 0 rgba(245, 242, 235, 0.05);
}

/* 深色主题 - 有内容时 */
.sabi-container.dark-theme .sabi-input.has-content {
  background: rgba(13, 9, 6, 0.88);
  border-color: rgba(245, 242, 235, 0.15);
  box-shadow:
    0 8px 32px rgba(0, 0, 0, 0.3),
    0 2px 8px rgba(0, 0, 0, 0.2),
    inset 0 1px 0 rgba(245, 242, 235, 0.1);
}

.sabi-container.dark-theme .sabi-input::before {
  background: radial-gradient(ellipse, rgba(0, 0, 0, 0.15) 0%, transparent 70%);
}

.sabi-container.dark-theme .input-controls {
  background: rgba(255, 255, 255, 0.05);
}

.sabi-container.dark-theme .control-label {
  color: rgba(245, 242, 235, 0.7);
}

.sabi-container.dark-theme .range-slider {
  background: rgba(245, 242, 235, 0.1);
}

.sabi-container.dark-theme .range-slider::-webkit-slider-thumb {
  background: var(--paper-white);
}

.sabi-container.dark-theme .range-slider::-moz-range-thumb {
  background: var(--paper-white);
}

.sabi-container.dark-theme .range-slider::-webkit-slider-thumb:hover {
  background: var(--accent-red);
}

.sabi-container.dark-theme .range-slider::-moz-range-thumb:hover {
  background: var(--accent-red);
}

.sabi-container.dark-theme .range-value {
  color: rgba(245, 242, 235, 0.7);
}

.sabi-container.dark-theme .input-frame {
  background: rgba(255, 255, 255, 0.05);
  border-color: var(--paper-white);
}

.sabi-container.dark-theme .input-field {
  color: var(--paper-white);
}

.sabi-container.dark-theme .input-field::placeholder {
  color: rgba(245, 242, 235, 0.3);
}

.sabi-container.dark-theme .send-button {
  background: var(--paper-white);
  color: var(--ink-black);
}

.sabi-container.dark-theme .send-button:hover {
  background: var(--accent-red);
  color: var(--paper-white);
}

/* ===== 响应式 ===== */
@media (max-width: 768px) {
  .sabi-controls {
    margin-left: 5%;
  }

  .message-item.user {
    margin-left: 5%;
  }

  .message-item.assistant {
    margin-right: 5%;
  }

  .title-main {
    letter-spacing: 0.1em;
  }

  .title-sub {
    letter-spacing: 0.2em;
  }

  .sabi-input {
    bottom: 20px;
    padding: var(--spacing-sm);
    width: calc(100% - var(--spacing-md) * 2);
  }

  .sabi-container {
    padding-bottom: 180px;
  }

  .scroll-to-bottom {
    right: 20px;
    bottom: 120px;
  }
}

/* ===== 打字机效果 ===== */
.typewriter {
  overflow: hidden;
  border-right: 2px solid var(--ink-black);
  animation:
    typing 3.5s steps(40, end),
    blink-caret 0.75s step-end infinite;
}

@keyframes typing {
  from { width: 0; }
  to { width: 100%; }
}

@keyframes blink-caret {
  from, to { border-color: transparent; }
  50% { border-color: var(--ink-black); }
}

/* ===== 平滑滚动 ===== */
@media (prefers-reduced-motion: no-preference) {
  html {
    scroll-behavior: smooth;
  }
}

/* ===== 历史管理面板 ===== */
.history-panel {
  position: fixed;
  top: 0;
  right: -400px;
  width: 400px;
  max-width: 90vw;
  height: 100vh;
  background: rgba(245, 242, 235, 0.98);
  backdrop-filter: blur(30px);
  -webkit-backdrop-filter: blur(30px);
  border-left: 1px solid rgba(13, 9, 6, 0.1);
  box-shadow: -8px 0 32px rgba(13, 9, 6, 0.15);
  z-index: 200;
  display: flex;
  flex-direction: column;
  transition: right 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  overflow: hidden;
}

.history-panel.open {
  right: 0;
}

.history-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-lg) var(--spacing-md);
  border-bottom: 1px solid rgba(13, 9, 6, 0.1);
}

.history-title {
  font-family: var(--font-display);
  font-size: 24px;
  font-weight: 600;
  color: var(--ink-black);
}

.history-close {
  width: 36px;
  height: 36px;
  background: transparent;
  border: 1px solid rgba(13, 9, 6, 0.2);
  border-radius: 8px;
  font-size: 28px;
  line-height: 1;
  color: var(--ink-black);
  cursor: pointer;
  transition: all 0.3s ease;
}

.history-close:hover {
  background: rgba(13, 9, 6, 0.05);
  transform: scale(1.05);
}

.history-actions {
  display: flex;
  gap: var(--spacing-sm);
  padding: var(--spacing-md);
  border-bottom: 1px solid rgba(13, 9, 6, 0.1);
}

.history-action-btn {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-sm);
  background: transparent;
  border: 1px solid rgba(13, 9, 6, 0.2);
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.3s ease;
}

.history-action-btn:hover {
  background: rgba(13, 9, 6, 0.05);
  border-color: var(--ink-black);
  transform: translateY(-2px);
}

.history-action-btn.danger:hover {
  background: rgba(200, 85, 61, 0.1);
  border-color: var(--accent-red);
}

.action-icon {
  font-family: var(--font-display);
  font-size: 24px;
  font-weight: 600;
  line-height: 1;
}

.action-text {
  font-size: 11px;
  color: var(--ink-fade);
  letter-spacing: 0.15em;
}

/* 深色主题下增强历史面板操作文字可见性 */
.sabi-container.dark-theme .action-text {
  color: rgba(245, 242, 235, 0.85);
}

.history-list {
  flex: 1;
  overflow-y: auto;
  padding: var(--spacing-md);
}

.history-item {
  background: rgba(255, 255, 255, 0.6);
  border: 1px solid rgba(13, 9, 6, 0.1);
  border-radius: 8px;
  padding: var(--spacing-md);
  margin-bottom: var(--spacing-sm);
  cursor: pointer;
  transition: all 0.3s ease;
  animation: slideInRight 0.3s ease;
}

@keyframes slideInRight {
  from {
    opacity: 0;
    transform: translateX(20px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.history-item:hover {
  background: rgba(255, 255, 255, 0.8);
  border-color: rgba(13, 9, 6, 0.2);
  transform: translateX(-4px);
}

.history-item-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-xs);
}

.history-item-date {
  font-size: 12px;
  color: var(--ink-fade);
  font-family: 'Courier New', monospace;
  letter-spacing: 0.05em;
}

.history-item-count {
  font-size: 11px;
  color: rgba(13, 9, 6, 0.5);
  background: rgba(13, 9, 6, 0.05);
  padding: 2px 8px;
  border-radius: 4px;
}

.history-item-preview {
  font-size: 13px;
  color: var(--ink-black);
  line-height: 1.6;
  overflow: hidden;
  text-overflow: ellipsis;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  margin-bottom: var(--spacing-xs);
}

.history-item-actions {
  display: flex;
  gap: var(--spacing-xs);
  margin-top: var(--spacing-sm);
}

.history-item-btn {
  padding: 4px 12px;
  background: transparent;
  border: 1px solid rgba(13, 9, 6, 0.2);
  border-radius: 4px;
  font-size: 11px;
  color: var(--ink-fade);
  cursor: pointer;
  transition: all 0.2s ease;
}

.history-item-btn:hover {
  background: var(--ink-black);
  color: var(--paper-white);
  border-color: var(--ink-black);
}

.history-item-btn.delete:hover {
  background: var(--accent-red);
  border-color: var(--accent-red);
}

/* 深色主题下增强历史面板按钮可见性 */
.sabi-container.dark-theme .history-item-btn {
  border-color: rgba(245, 242, 235, 0.3);
  color: rgba(245, 242, 235, 0.7);
  background: rgba(255, 255, 255, 0.05);
}

.sabi-container.dark-theme .history-item-btn:hover {
  background: var(--paper-white);
  color: var(--ink-black);
  border-color: var(--paper-white);
}

.sabi-container.dark-theme .history-item-btn.delete:hover {
  background: var(--accent-red);
  color: var(--paper-white);
  border-color: var(--accent-red);
}

.history-empty {
  text-align: center;
  padding: var(--spacing-xl) var(--spacing-md);
  color: var(--ink-fade);
  font-style: italic;
}

.overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(13, 9, 6, 0.3);
  backdrop-filter: blur(4px);
  z-index: 150;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
}

.overlay.show {
  opacity: 1;
  visibility: visible;
}

/* 深色主题 */
.sabi-container.dark-theme .history-panel {
  background: rgba(13, 9, 6, 0.98);
  border-left-color: rgba(245, 242, 235, 0.1);
}

.sabi-container.dark-theme .history-title {
  color: var(--paper-white);
}

.sabi-container.dark-theme .history-close {
  border-color: rgba(245, 242, 235, 0.2);
  color: var(--paper-white);
}

.sabi-container.dark-theme .history-action-btn {
  border-color: rgba(245, 242, 235, 0.25);
  background: rgba(255, 255, 255, 0.08);
}

.sabi-container.dark-theme .history-action-btn:hover {
  background: rgba(255, 255, 255, 0.15);
  border-color: rgba(245, 242, 235, 0.35);
}

.sabi-container.dark-theme .action-icon {
  color: rgba(245, 242, 235, 0.95);
}

.sabi-container.dark-theme .history-item {
  background: rgba(255, 255, 255, 0.05);
  border-color: rgba(245, 242, 235, 0.1);
  color: var(--paper-white);
}

.sabi-container.dark-theme .history-item-preview {
  color: var(--paper-white);
}

.sabi-container.dark-theme .overlay {
  background: rgba(0, 0, 0, 0.5);
}

/* 响应式 */
@media (max-width: 768px) {
  .history-panel {
    width: 100vw;
    right: -100vw;
  }

  .history-actions {
    flex-wrap: wrap;
  }

  .history-action-btn {
    flex-basis: calc(50% - var(--spacing-xs));
  }
}